Keywords:
Make a page that, half of the time, tells you to do something:
The rest of the time, it tells you not to do it:
It's random. You can try it.
This one's easy. First, add some HTML like this:
<h2>Things to <span id="not">not</span> do</h2>
On page load:
if ( Math.random() > 0.5 ) {
$("#not").hide();
}
Math.random()
returns a random number between 0 and 1.
You can change the test. For example, do not do on a weekday, do on a weekend.